Half to the e



' (No Model.) J E. EMERSON.

SAW,

Patented June 2, 1896.

IN VE N 70/? WITNESSES.-

JZvmx/s E. Ewe/T81271 ANDREW EGRMIAM, WOTUUTHQWASHINGTON. DYE.

p NITED STATES PATENT OFFICE.

JAMES E. EMERSON, OF BEAVER FALLS, PENNSYLVANIA, ASSIGNOR OF ONE- HALFTO THE E. C. ATKINS & COMPANY, OF INDIANAPOLIS, INDIANA.

SAW.

- SPECIFICATION forming part of Letters Patent No. 561,098, dated June2, 1896.

Application filed June 10, l 8 9 5.

To all whom, it may concern:

Be it known that I, JAMES E. EMERSON, a citizen of the UnitedStates,residin g at Beaver Falls, in the county of Beaver and State ofPennsylvania, have invented certain new and useful Improvements in Saws,of which the following is a specification.

My invention relates to that class of saws commonly known asinserted-tooth saws, and its object is to so construct the various toothportions and attaching devices that the tooth-points may be readily andconveniently attached and detached as the necessity therefor arisesresulting from wear and breakage.

While my invention is not limited to any particular form of saws, it isespecially designed to be used with band-saws in which, from theirnature, if detachable tooth-points are to be used at all they must be ofcomparatively small size and occupy but a comparatively small spacelongitudinally of the saw, owing to the constant flexure of the sawbladeas it passes over the wheels or pulleys which carry it. Such teeth ortooth-points have heretofore been produced, but the means of securingthem to the saw-blade has commonly included rivets or equivalentdevices; but in the sawmill, where the greater portion of such work hasto be done, these have been difficult to'remove and replace.

By my present invention, as will be hereinafter more particularlydescribed and claimed, I am enabled to secure the toothpoints in placewithout the use of rivets.

A saw provided with teeth. embodying my said invention is shown in theaccompanying drawings, in which- Figure 1 is a perspective view of afragment of a band-saw and one of the wheels over which it commonly runsin the position they occupy when such band-saw is in use; Fig. 2, aview, partly in side elevation and partly in central section, of afragment of the sawblade and two of its teeth on an enlarged scale aboutdouble theactual size such teeth are commonly made; and Fig. 3, a detailsectional view on the dotted line 3 3 in Fig. 2.

In said drawings the portions marked A represent the body of thesaw-blade; B, the tooth-point holders attached to projections Serial No.552,316. (No model.)

on said saw-blade, which projections are the bases or body portions ofthe teeth; 0, the tooth-points, and D wedges by which said tooth-pointsare held in place.

The saw-blade A has the usual tooth projections A, which form the basesor bodies of the saw-teeth, and these projections are formed to suit theparticular style of toothpoint holders and tooth-points and wedgeshereinafter described.

The tooth-point holders are substantially U-shaped vertically, as shownmost plainly in the sectional view, Fig. 3, and are adapted to embracethe tooth-points and wedges, as shown. Said tooth-point holders areadapted to be permanently attached to the tooth projections A either bythe rivets a or by brazing, or otherwise, as may be desired. I preferthat three rivets, as shown, be used, as this means of attachment isinexpensive and quite efficient. As will be noticed, especially by thelower portion of Fig. 2, the inner surfaces of the transverse portionsof these toothpoint holders are curved to conform to the re quirement ofthe curved wedge. The outer surface may be as desired. I have shown thefront convex in full lines; but it may obviously be concave, as shown indotted lines, or otherwise.

The tooth-points O are in themselves not greatly dissimilar toformerly-produced toothpoints, except that the extreme lower ends arewidened or swelled out, so that when the wedges are inserted they areheld in place by their own formation, the wider portions being below theengaging parts of the wedges, as shown.

The wedges D are of the same thickness as the saw-blade and the lowerportions of the tooth-points in one direction and are curved and taperedsomewhat in the other direction. They are adapted to be driven in afterthe tooth-points are inserted, and thus lock said tooth-points firmly inplace. They are capable of being driven in from the lower sides of thetooth-point holders or throats of the sawteeth, and thus so situated asnot to project up near the cutting-points, while such centrifugal oroutward force as may be exerted tends to force the wedges in rather thanout, which is of considerable importance when IOC.

the invention is applied to circular saws, to which, of course, it maybe applied without departing from my invention. As shown, these wedgesare so formed that at the heel they bear most strongly against the lowerportions of the tooth projections and at the point against thetooth-point on one side, while they first come against the inner side ofthe Ushaped tooth-holder in the middle 011 the other side, thus givingsomewhat of a spring as well as a wedge force in looking the toothpointsin place. At the lower end they either have a notch or a perforation, asshown, so that they may be easily driven out whenever desired. \Vhendriven entirely in, they fit tightly and hold the tooth-points assecurely as would be done by rivets or any other means, while they arecapable of being easily removed when desired and of repeated use. Thesewedges, too, can be removed and replaced much more quickly than rivetscan. There is no danger of their being accidentally misplaced, becausewhatever pressure comes upon their exposed ends from the sawdust orotherwise tends rather to drive them in than to force them out.

Having thus fully described my said invention what I claim as new anddesire to secure S 7 by Letters Patent, is

1. The combination, with a saw-blade having tooth projections or basesthereon, of tooth-point holders embracing said projections and formed toconstitute three walls of a socket to receive the tooth-point andsecuring-wedge, the fourth wall of said socket being the edge of saidtooth-base, said toothpoints mounted in said sockets, and thesecuring-wedges inserted in said sockets to bear against and secure saidtooth-points, substantially as set forth.

2. The combination of a saw-blade having tooth projections or bases,tooth-point holders secured to said projections and forming sockets forthe tooth-points and the securingwedges, said sockets being open at thebottom next the throats of the saw-teeth, tooth points adapted to beinserted in said sockets, and wedges also adapted to be inserted in saidsockets through said openings at the lower ends thereof, substantiallyas set forth.

The combination of a saw-plate having tooth projections or bases,tooth-point holders secured to said projections and thus for1ningsockets for the tooth-points, tooth-points adapted to be inserted insaid sockets, and curved tapered wedges formed to bear against thesaw-blade at one end and the tooth-points at the other end on one side,and against interior surfaces of the tooth-point holders on the otherside, whereby a spring as well a wedge lock is provided for thetooth-points, substantially as shown and described.

In witness whereof I have hereunto set my hand and seal, atIndianapolis, Indiana, this 8th day of June, A. D. 1895.

JAMES E. EMERSON.

